Metcalf, W. (1896). Steel: A manual for steel users. J. Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Metcalf, William. Steel: A Manual for Steel Users. New York: J. Wiley & Sons, 1896.
Lua MLA (8ú heag.)Metcalf, William. Steel: A Manual for Steel Users. J. Wiley & Sons, 1896.
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